Hon Im sorry to hear of that horrible thing that happend to you years ago! I wish I could give you advise as to the length of time before conception, DH and I have not yet been trying for over 6 mo but I feel we will be we are on our 3rd mo and no real signs in my mind that this is the month. I know how you must feel because of the other children he already has. My situation is the opposite I have a 7 year old soon to be 8 in november with her father the first time I got pregnant was in two month of being with him sadly I had MC but was preg with my daughter within another couple of months. Now this time around im 28 and DH is 38 he never has had any children not even unplanned accidents so I start to worry that maybe the issues are with him. All I can say is take one day at a time and try not to stress to much untill you are beyond a year of trying! I just have to belive when its the right time it will happen this is what keeps me sane! I hope you get your BFP soon!